The Science of a Sundae: Using the Principle of Colligative Properties in Food Science Outreach Activities for Middle and High School Students

The opportunities for outreach activities for professionals and academics in food science are extensive, as too are the range of participants’ experience levels and platforms for delivery. Here, we present a set of activities that are readily adaptable for a range of students (ages 10 to 18) in multiple platforms (demonstration table and hands‐on workshop). Our activity, collectively called “The Science of a Sundae,” has three units, one for each of the three parts of a sundae: the caramel sauce, the cherry, and the ice cream. In each unit we use these familiar food items to illustrate how colligative properties (or, simply, “solutions” for younger students) impact the chemical, microbiological, and sensorial properties of food. We have used these activities to present to over 1000 students and their parents/chaperones. Grade levels of student participants have ranged from 5th grade through high school, and these activities have been presented in the form of a demonstration table at science events as well as a set of three 45‐minute workshops in a classroom setting. Educational impact of these activities was evaluated with 7th grade students (n = 77) who participated in the 3‐phase workshop. On average, students who took the posttest (after participation in the workshop) scored 36% higher than students who took the pretest (prior to participation in the workshop). These results and instructor observations suggest the merit of this lesson and its adaptability among ages and platforms.     

Queering high school biology textbooks

As teachers committed to educating all students, we need to learn more about how instructional materials shape representations of sexuality and gender. Through its insistent deconstruction of the norms that structure practice and belief, queer theory offers perspectives from which science educators can question assumptions embedded in textbooks. This article applies queer theory to analyze eight biology textbooks used in the United States. Specifically, we ask how biology textbooks address sexuality outside the heterosexual norm and if they propagate heteronormative attitudes. The textbooks examined offer deafening silences, antiseptic factoids, socially sanitized concepts, and politically correct binary‐gendered illustrations. In these textbooks, the term homosexuality was used only in the context of AIDS where, along with iv drug users, they were identified as an affected group. The pervasive acceptance of heteronormative behavior privileges students that fit the heterosexual norm, and oppresses through omission and silence those who do not. We offer implications for practice to help science educators broaden their perspectives on the constructs of sexuality and gender to construct new ways of knowing and understanding differences in science classrooms and the natural world. © 2004 Wiley Periodicals, Inc. J Res Sci Teach 41: 617–636, 2004     

Re-mediating knowledge infrastructures: a site for innovation in teacher education

ABSTRACT

The article outlines a framework for studying and organizing infrastructure, social and material to advance consequential knowledge. To demonstrate the utility of the framework, three examples of innovation in teacher education are presented that involve re-mediating infrastructure to imagine equity-oriented teacher learning. The first case focuses on re-mediating social resources to create new pathways for knowledge and expertise to flow between a school and a university teacher education programme. The second case considers how re-mediating social and material resources, specifically who is involved in designing the goals of a teacher education programme, expanded conceptions of the valued outcomes of teacher preparation. The third case addresses the impact of an innovation that re-mediated technical and social resources to support teachers’ professional judgment in classroom interactions. As teacher educators, we need to be open to shifting our purposes and our designs in response to changing institutional, political, and practical circumstances. This framework for organizing and re-mediating infrastructure provides a means of doing this work in principled and responsible ways.     

Hypothetico-deductive reasoning skill and concept acquisition: Testing a constructivist hypothesis

This study tested the constructivist hypothesis that the acquisition of domain-specific conceptual knowledge (declarative knowledge) requires use of general procedural knowledge. More specifically, it was hypothesized that use of a general pattern of hypothetico-deductive reasoning is necessary for the acquisition of novel domain-specific concepts. To test this hypothesis 314 high school biology and chemistry students were first tested to determine whether or not they were skilled in the use of hypothetico-deductive reasoning. Based on this test, students were classified as reflective, transitional, or intuitive thinkers. All students were then presented with a series of four concept-acquisition tasks. It was predicted that reflective (hypothetico-deductive) thinkers would acquire the concepts while intuitive (empirico-inductive) thinkers would not. Transitional thinkers were expected to be partially successful. These predictions were confirmed as skill in hypothetico-deductive reasoning (developmental level), but not age, was highly correlated with performance on the concept acquisition tasks (X² = 71.14, p < 0.00001). This result was interpreted to be supportive of the constructivist hypothesis.     

Perspective and engagement in counseling and psychotherapy: The phenomenological approach

A phenomenological view of counseling and psychotherapy is introduced via a consideration of Freudian and Rogerian approaches to these activities. Both the Freudian and Rogerian approaches are seen to be based on an attempted disengagement between therapist and client. This attempted disengagement is found in the invalidation of the client's perpective by the therapist. The ackowledgment of the validity of the perspective of both therapist and client, and of the engagement resulting from the meeting of perspectives in interation, is the basis for counseling and psychotherapy from a phenomenological approach.     

Diagnosing and dealing with salary compression

Newly hired faculty members in certain disciplines demand and receive salaries that approach or exceed those of existing faculty at the same or higher professional rank. This phenomenon is often referred to as salary compression. This paper presents methods used to determine if salary compression exists and the extent to which it exists. In addition, the results of a phone survey of university provosts provide information on how university administrators address the issue of salary compression.Presented at the Thirty-first Annual Forum of the Association for Institutional Research, San Francisco, May 26–29, 1991. Represents revision and enhancement of a paper presented at the 1990 SAIR/SCUP Conference.     

Coping with abstraction in object orientation with a special focus on interface classes

One of the subjects that undergraduate students learning Object Oriented (OO) design find hard to apply is the construction of class hierarchies in general, and the use of interface classes in particular. The design process requires decomposition and reconstruction of problems in order to model software classes. The common attributes and behaviors are usually modeled using class inheritance except when the common behaviors do not belong to the same class hierarchy; in such case, an interface class is preferred. In order to be able to properly design, the designer has to demonstrate the abstraction abilities on various levels. In this study, we aimed at examining the students' demonstration of abstraction levels during design of class hierarchy in general, and whether or not they use interface classes in particular. The results of the study reveal that a majority of students were able to build a reasonable class hierarchy; however, many of them did not use interface classes as a tool for expressing common behaviors. Nevertheless, all of them could identify and choose the best solution for a particular problem among four different solutions, which included the use of interface class.